Plex external config flow (#26936)

* Plex external auth config flow

* Update requirements_all

* Test dependency

* Bad await, delay variable

* Use hass aiohttp session, bump plexauth

* Bump requirements

* Bump library version again

* Use callback view instead of polling

* Update tests for callback view

* Reduce timeout with callback

* Review feedback

* F-string

* Wrap sync call

* Unused

* Revert unnecessary async wrap

script/gen_requirements_all.py

@@ -113,6 +113,7 @@ TEST_REQUIREMENTS = (
     "pilight",
     "pillow",
     "plexapi",
+    "plexauth",
     "pmsensor",
     "prometheus_client",
     "ptvsd",